do not extend enumerations

src/models.py

@@ -13,17 +13,16 @@ __module_name__ = "models"
 __version__text__ = "1"
 
 
-class StatusEnum(enum.Enum):
+class DeviceStatusEnum(enum.Enum):
+    error = "error"
     online = "online"
     offline = "offline"
 
 
-class DeviceStatusEnum(StatusEnum):
-    error = "error"
-
-
-class SensorStatusEnum(StatusEnum):
+class SensorStatusEnum(enum.Enum):
     unknown = "unknown"
+    online = "online"
+    offline = "offline"
 
 
 class Device(db.Model):